(19)
(11) EP 2 811 633 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.07.2015 Bulletin 2015/29

(43) Date of publication A2:
10.12.2014 Bulletin 2014/50

(21) Application number: 14171100.2

(22) Date of filing: 04.06.2014
(51) International Patent Classification (IPC): 
H02M 1/14(2006.01)
H02M 1/00(2007.01)
 H02M 7/493(2007.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 05.06.2013 US 201313910656

(71) Applicant: Rockwell Automation Technologies, Inc.
Mayfield Heights, OH 44124 (US)

(72) Inventors:
  • Huang, Rongjun
    Saint Louis, MO 63119 (US)
  • Winterhalter, Craig
    Cedarburg, WI 53012 (US)
  • Gries, Mark
    Milwaukee, WI 53211 (US)
  • Li, Ye
    Madison, WI 53705 (US)

(74) Representative: Grünecker Patent- und Rechtsanwälte PartG mbB 
Leopoldstraße 4
80802 München
80802 München (DE)

   


(54) System and method for reducing reactive current on a common DC bus with multiple inverters


(57) A system configured to reduce the amplitude of reactive current present on a DC bus (13) shared by multiple inverters (15) is disclosed. The start of the switching period for the modulation routines of each inverter (15) is synchronized, and a carrier phase angle is determined for a carrier signal within each of the inverters (15). The modulation routine of each inverter (15) generates a reactive current on the shared DC bus (13). By controlling the carrier phase angle for each inverter (15), the reactive current of a first inverter (15) may be generated at a phase angle that is offset from the phase angle of the reactive current generated by a second inverter (15). As a result, the reactive current from the first inverter (15) cancels at least a portion of the reactive current from the second inverter (15), reducing the total reactive current present on the DC bus (13).







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